C868 datasheet(62/82 Pages) INFINEON

62 / 82 page

C868

Data Sheet

V 1.0, 2003-05

lf two or more requests of different priority levels are received simultaneously, the

request of the highest priority is serviced first. lf requests of the same priority level are

received simultaneously, an internal polling sequence determines which request is to be

serviced first. Thus, within each priority level there is a second priority structure

determined by the polling sequence. This is illustrated in Table 13

Within a column, the topmost interrupt is serviced first, then the second and the third,

when available. The interrupt groups are serviced from left to right of the table. A low-

priority interrupt can itself be interrupted by a higher-priority interrupt, but not by another

interrupt of the same or a lower priority. An interrupt of the highest priority level cannot

be interrupted by another interrupt source.

Table 13

Interrupt Source Structure

Interrupt

Group

Priority Bits

of Interrupt

Group

Interrupt Source Priority

High Priority

Low

Priority

IP0.0

EXINT0

IADC

High

Low

IP0.1

TF0

EXINT2

IP0.2

EXINT1

EXINT3

INP01)

1) Capture/compare has 10 interrupt sources channeled to the 4 interrupt nodes INP0..3. The 3 capture/

compare ports has 3 pairs of interrupt request flags, ICC60R, ICC60F, ICC61R, ICC61F, ICC62R, ICC62F.

The other flags are T12OM, T12PM, T13CM, T13PM, TRPF, WHE, CHE.

IP0.3

TF1

INP11)

IP0.4

RI + TI

INP21)

IP0.5

TF2

INP31)

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